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U |
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| ulimit — get and set process limits ( ) |
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| umask — set and get file creation mask ( ) |
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| umount — unmount a file system ( ) |
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| umount2 — unmount a file system ( ) |
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| uname — get name of current operating system ( ) |
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| unlink — remove directory entry ( ) |
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| unlinkat — remove directory entry ( ) |
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| unmount a file system — umount2 ( ) |
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| unmount a file system — umount ( ) |
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| user audit identity |
| | get user audit identity — getauid ( ) |
| | set user audit identity — setauid ( ) |
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| user ID, set real and effective — setreuid() ( ) |
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| user IDs |
| | get — getuid, geteuid ( ) |
| | set — setuid ( ) |
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| utime — set file access and modification times ( ) |
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| utimes — set file access and modification times ( ) |